Constant current circuit

Abstract

Abstract PURPOSE:To perform driving stably to variation in power voltage by specifying a current value on the basis of base-emitter rising voltages of transistors (TR) or the forward voltage of a diode and a resistance ratio. CONSTITUTION:The series circuit of a DC impedance element 21 and the collector-emitter path of the 1st TR11 is connected between one DC power terminal 5 and the earth, the collector-emitter path of the 2nd TR12 is connected between the terminal 5 and the base of the TR11, and the collector-emitter path of the 3rd TR13 is connected between its emitter and the earth. Then, the bases of the TRs 11 and 12 are connected, and the collector of the TR11 is connected to the base of the TR12 to derive an output voltage between terminal 24 and 25.

Inventors

• 👤 Hideo Imaizumi
• 👤 英雄 今泉

Bibliographic Details